\documentclass[tikz]{standalone}
\usepackage{pgflibraryshapes}
\usetikzlibrary{backgrounds}
\usetikzlibrary{arrows}
\begin{document}
Simplicial Mesh for process {\textcolor{gray}0}, and {\textcolor{orange}1}.
\begin{tikzpicture}[scale = 1.,font=\fontsize{8}{8}\selectfont]
\path (0.,1.) node(8_0) [draw,shape=circle,color=gray] {8};
\path (1.,1.) node(9_0) [draw,shape=circle,color=gray] {9};
\path (2.,1.) node(10_0) [draw,shape=circle,color=gray] {10};
\path (0.,2.) node(11_0) [draw,shape=circle,color=gray] {11};
\path (1.,2.) node(12_0) [draw,shape=circle,color=gray] {12};
\path (2.,2.) node(13_0) [draw,shape=circle,color=gray] {13};
\path (0.5,1.) node(14_0) [draw,shape=circle,color=gray] {14};
\path (1.5,1.) node(15_0) [draw,shape=circle,color=gray] {15};
\path (0.5,2.) node(16_0) [draw,shape=circle,color=gray] {16};
\path (1.5,2.) node(17_0) [draw,shape=circle,color=gray] {17};
\path (0.,1.5) node(18_0) [draw,shape=circle,color=gray] {18};
\path (1.,1.5) node(19_0) [draw,shape=circle,color=gray] {19};
\path (2.,1.5) node(20_0) [draw,shape=circle,color=gray] {20};
\path (0.5,1.5) node(21_0) [draw,shape=circle,color=gray] {21};
\path (1.5,1.5) node(22_0) [draw,shape=circle,color=gray] {22};
\path (0.,0.) node(8_1) [draw,shape=circle,color=orange] {8};
\path (1.,0.) node(9_1) [draw,shape=circle,color=orange] {9};
\path (2.,0.) node(10_1) [draw,shape=circle,color=orange] {10};
\path (0.,1.) node(11_1) [draw,shape=circle,color=orange] {11};
\path (1.,1.) node(12_1) [draw,shape=circle,color=orange] {12};
\path (2.,1.) node(13_1) [draw,shape=circle,color=orange] {13};
\path (0.5,0.) node(14_1) [draw,shape=circle,color=orange] {14};
\path (1.5,0.) node(15_1) [draw,shape=circle,color=orange] {15};
\path (0.5,1.) node(16_1) [draw,shape=circle,color=orange] {16};
\path (1.5,1.) node(17_1) [draw,shape=circle,color=orange] {17};
\path (0.,0.5) node(18_1) [draw,shape=circle,color=orange] {18};
\path (1.,0.5) node(19_1) [draw,shape=circle,color=orange] {19};
\path (2.,0.5) node(20_1) [draw,shape=circle,color=orange] {20};
\path (0.5,0.5) node(21_1) [draw,shape=circle,color=orange] {21};
\path (1.5,0.5) node(22_1) [draw,shape=circle,color=orange] {22};
\path
(0.5,2.) node(23_0) [draw,shape=circle,color=gray] {23} --
(1.5,2.) node(24_0) [draw,shape=circle,color=gray] {24} --
(2.5,2.) node(25_0) [draw,shape=circle,color=gray] {25} --
(3.5,2.) node(26_0) [draw,shape=circle,color=gray] {26} --
(0.5,4.) node(27_0) [draw,shape=circle,color=gray] {27} --
(1.5,4.) node(28_0) [draw,shape=circle,color=gray] {28} --
(2.5,4.) node(29_0) [draw,shape=circle,color=gray] {29} --
(3.5,4.) node(30_0) [draw,shape=circle,color=gray] {30} --
(0.,2.5) node(31_0) [draw,shape=circle,color=gray] {31} --
(0.,3.5) node(32_0) [draw,shape=circle,color=gray] {32} --
(2.,2.5) node(33_0) [draw,shape=circle,color=gray] {33} --
(2.,3.5) node(34_0) [draw,shape=circle,color=gray] {34} --
(4.,2.5) node(35_0) [draw,shape=circle,color=gray] {35} --
(4.,3.5) node(36_0) [draw,shape=circle,color=gray] {36} --
(1.,2.5) node(37_0) [draw,shape=circle,color=gray] {37} --
(1.5,3.) node(38_0) [draw,shape=circle,color=gray] {38} --
(1.,3.5) node(39_0) [draw,shape=circle,color=gray] {39} --
(0.5,3.) node(40_0) [draw,shape=circle,color=gray] {40} --
(3.,2.5) node(41_0) [draw,shape=circle,color=gray] {41} --
(3.5,3.) node(42_0) [draw,shape=circle,color=gray] {42} --
(3.,3.5) node(43_0) [draw,shape=circle,color=gray] {43} --
(2.5,3.) node(44_0) [draw,shape=circle,color=gray] {44} --
(0.5,0.) node(23_1) [draw,shape=circle,color=orange] {23} --
(1.5,0.) node(24_1) [draw,shape=circle,color=orange] {24} --
(2.5,0.) node(25_1) [draw,shape=circle,color=orange] {25} --
(3.5,0.) node(26_1) [draw,shape=circle,color=orange] {26} --
(0.5,2.) node(27_1) [draw,shape=circle,color=orange] {27} --
(1.5,2.) node(28_1) [draw,shape=circle,color=orange] {28} --
(2.5,2.) node(29_1) [draw,shape=circle,color=orange] {29} --
(3.5,2.) node(30_1) [draw,shape=circle,color=orange] {30} --
(0.,0.5) node(31_1) [draw,shape=circle,color=orange] {31} --
(0.,1.5) node(32_1) [draw,shape=circle,color=orange] {32} --
(2.,0.5) node(33_1) [draw,shape=circle,color=orange] {33} --
(2.,1.5) node(34_1) [draw,shape=circle,color=orange] {34} --
(4.,0.5) node(35_1) [draw,shape=circle,color=orange] {35} --
(4.,1.5) node(36_1) [draw,shape=circle,color=orange] {36} --
(1.,0.5) node(37_1) [draw,shape=circle,color=orange] {37} --
(1.5,1.) node(38_1) [draw,shape=circle,color=orange] {38} --
(1.,1.5) node(39_1) [draw,shape=circle,color=orange] {39} --
(0.5,1.) node(40_1) [draw,shape=circle,color=orange] {40} --
(3.,0.5) node(41_1) [draw,shape=circle,color=orange] {41} --
(3.5,1.) node(42_1) [draw,shape=circle,color=orange] {42} --
(3.,1.5) node(43_1) [draw,shape=circle,color=orange] {43} --
(2.5,1.) node(44_1) [draw,shape=circle,color=orange] {44} --
(0,0);
\draw[color=gray] (8_0) -- (14_0) -- (21_0) -- (18_0) -- (8_0);
\draw[color=gray] (14_0) -- (9_0) -- (19_0) -- (21_0) -- (14_0);
\draw[color=gray] (21_0) -- (19_0) -- (12_0) -- (16_0) -- (21_0);
\draw[color=gray] (18_0) -- (21_0) -- (16_0) -- (11_0) -- (18_0);
\draw[color=gray] (9_0) -- (15_0) -- (22_0) -- (19_0) -- (9_0);
\draw[color=gray] (15_0) -- (10_0) -- (20_0) -- (22_0) -- (15_0);
\draw[color=gray] (22_0) -- (20_0) -- (13_0) -- (17_0) -- (22_0);
\draw[color=gray] (19_0) -- (22_0) -- (17_0) -- (12_0) -- (19_0);
\draw[color=orange] (8_1) -- (14_1) -- (21_1) -- (18_1) -- (8_1);
\draw[color=orange] (14_1) -- (9_1) -- (19_1) -- (21_1) -- (14_1);
\draw[color=orange] (21_1) -- (19_1) -- (12_1) -- (16_1) -- (21_1);
\draw[color=orange] (18_1) -- (21_1) -- (16_1) -- (11_1) -- (18_1);
\draw[color=orange] (9_1) -- (15_1) -- (22_1) -- (19_1) -- (9_1);
\draw[color=orange] (15_1) -- (10_1) -- (20_1) -- (22_1) -- (15_1);
\draw[color=orange] (22_1) -- (20_1) -- (13_1) -- (17_1) -- (22_1);
\draw[color=orange] (19_1) -- (22_1) -- (17_1) -- (12_1) -- (19_1);
\end{tikzpicture}
\end{document}