\documentclass[tikz]{standalone}

\usepackage{pgflibraryshapes}
\usetikzlibrary{backgrounds}
\usetikzlibrary{arrows}
\begin{document}
\begin{tikzpicture}[scale = 1.,font=\fontsize{8}{8}\selectfont]
\path (0.,0.) node(8_0) [draw,shape=circle,color=gray] {8};
\path (1.,0.) node(9_0) [draw,shape=circle,color=gray] {9};
\path (2.,0.) node(10_0) [draw,shape=circle,color=gray] {10};
\path (0.,1.) node(11_0) [draw,shape=circle,color=gray] {11};
\path (1.,1.) node(12_0) [draw,shape=circle,color=gray] {12};
\path (2.,1.) node(13_0) [draw,shape=circle,color=gray] {13};
\path (0.,2.) node(14_0) [draw,shape=circle,color=gray] {14};
\path (1.,2.) node(15_0) [draw,shape=circle,color=gray] {15};
\path (2.,2.) node(16_0) [draw,shape=circle,color=gray] {16};
\draw[color=gray] (8_0) -- (9_0) -- (11_0) -- (8_0);
\draw[color=gray] (12_0) -- (14_0) -- (11_0) -- (12_0);
\draw[color=gray] (11_0) -- (9_0) -- (12_0) -- (11_0);
\draw[color=gray] (12_0) -- (10_0) -- (13_0) -- (12_0);
\draw[color=gray] (10_0) -- (12_0) -- (9_0) -- (10_0);
\draw[color=gray] (15_0) -- (13_0) -- (16_0) -- (15_0);
\draw[color=gray] (13_0) -- (15_0) -- (12_0) -- (13_0);
\draw[color=gray] (12_0) -- (15_0) -- (14_0) -- (12_0);
\path (0.333333,0.333333) node(0_0) [draw,shape=circle,color=gray] {0};
\path (0.333333,1.33333) node(1_0) [draw,shape=circle,color=gray] {1};
\path (0.666667,0.666667) node(2_0) [draw,shape=circle,color=gray] {2};
\path (1.66667,0.666667) node(3_0) [draw,shape=circle,color=gray] {3};
\path (1.33333,0.333333) node(4_0) [draw,shape=circle,color=gray] {4};
\path (1.66667,1.66667) node(5_0) [draw,shape=circle,color=gray] {5};
\path (1.33333,1.33333) node(6_0) [draw,shape=circle,color=gray] {6};
\path (0.666667,1.66667) node(7_0) [draw,shape=circle,color=gray] {7};
\end{tikzpicture}
\end{document}