\newcommand{\arrow}[2]{\path [-{Latex[scale=1]}] (#1) edge (#2);}

\begin{tikzpicture}

  \begin{scope}[every node/.style={shape=circle, fill=white, draw, inner sep=2pt}]
    %NODES
  \end{scope}

  \begin{scope}[every draw/.style={}]
    %EDGES
  \end{scope}

\end{tikzpicture}