[Tex/LaTex] Drawing a graph with small vertices

Question

I used tikz to draw a digraph as follows –

 \begin{tikzpicture}[roundnode/.style={circle, draw=black!60, very thick,minimum size=4mm}]
            %Nodes
            \node[roundnode]      (u1)                     {$u_1$};
            \node[roundnode]      (u2)       [right=of u1] {$u_2$};
            \node[roundnode]      (u3)       [below right=of u2] {$u_3$};
            \node[roundnode]      (u4)       [below left =of u3] {$u_4$};
            \node[roundnode]      (u5)       [left =of u4] {$u_5$};
            \node[roundnode]      (u6)       [below left =of u1] {$u_6$};

            %Lines
            \draw[->] (u2) -- (u5);
            \draw[->] (u2) -- (u6);
            \draw[->] (u3) -- (u5);
            \draw[->] (u3) -- (u6);
            \draw[->] (u4) -- (u5);
            \draw[->] (u4) -- (u6); 
          \end{tikzpicture}

This gives

However I want the nodes to be small dots with the vertex labelled next to it.

Can someone help me with this?

Thank you.

Answer 1

Like this?

\documentclass[tikz,border=2mm]{standalone} 
\usetikzlibrary{positioning, fit}

\begin{document}
\begin{tikzpicture}[roundnode/.style={circle, fill=black!60, inner sep=0pt, minimum size=4mm}]

    \foreach \i [count=\ni] in {120, 60, ..., -180}
        \node[roundnode, label=\i:{$u_\ni$}] at (\i:2cm) (u\ni) {};

            %Lines
            \draw[->] (u2) -- (u5);
            \draw[->] (u2) -- (u6);
            \draw[->] (u3) -- (u5);
            \draw[->] (u3) -- (u6);
            \draw[->] (u4) -- (u5);
            \draw[->] (u4) -- (u6); 
          \end{tikzpicture}
\end{document}