+    \draw[thick] (L) -- (N) -- (G) -- (I) -- (O) -- (F) -- (L)

+                     -- (C) -- (J) -- (P) -- (G) -- (A) -- (J) -- (H) -- (O);

+\usepackage{tikz}

+\usetikzlibrary{positioning}

+\begin{document}

+\begin{tikzpicture}

+    [%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

+     node distance=0.6cm,

+        place/.style={circle,draw=blue!50,fill=blue!20,thick,

+                      inner sep=0pt,minimum size=6mm}

+    ]%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

+    \draw[step=1cm,cyan,very thin] (-5, 5) grid (4,-4);

+    \node[place] (L) at (-4,4) {L};

+    \begin{scope}[node distance=6cm]

+    \node[place] (N) [right=of L]  {N};

+    \node[place] (O) [below=of L]  {O};

+    \node[place] (I) [below=of N]  {I};

+    \end{scope}

+    \node[place] (F)  at (barycentric cs:L=0.1,O=0.1)  {F};

+    \node[place] (G)  at (barycentric cs:N=0.1,I=0.1)  {G};

+

+    \node[place] (K) [right=of F] {K};

+    \node[place] (D) [above=of F] at (barycentric cs:F=0.1,K=0.1)  {D};

+    \node[place] (M) [below=of F] at (barycentric cs:F=0.1,K=0.1)  {M};

+

+    \node[place] (J) [left=of G] {J};

+    \node[place] (A) [above=of G] at (barycentric cs:G=0.1,J=0.1)  {A};

+    \node[place] (P) [below=of G] at (barycentric cs:G=0.1,J=0.1)  {P};

+

+    \begin{scope}[node distance=1.2cm]

+    \node[place] (E) [right=of D] {E};

+    \node[place] (C) [left=of  A] {C};

+    \node[place] (B) [right=of M] {B};

+    \node[place] (H) [left=of  P] {H};

+    \end{scope}

+

+    \draw[thick] (L) -- (N) -- (G) -- (I) -- (O) -- (F) -- (L);

+    \draw[thick] (L) -- (C) -- (J) -- (P) -- (G) -- (A) -- (J) -- (H) -- (O);

+    \draw[thick] (N) -- (E) -- (K) -- (M) -- (F) -- (F) -- (D) -- (K) -- (B) -- (I);

+    \draw[thick] (E) -- (C);

+    \draw[thick] (B) -- (H);

+

+\end{tikzpicture}