مقداری از کد را برایتان کشیدم امیدوارم خودتان بتوانید کاملش کنید.
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\coordinate (u4) at (-1.5,0) ;
\coordinate (u1) at (-.5,0) ;
\coordinate (u6) at (.5,0) ;
\coordinate (u5) at (1.5,0) ;
\coordinate (u2) at (-4,-2) ;
\fill (u4) circle (1mm) node [above, ] {$u_4$};
\fill (u1) circle (1mm) node[above, ]{$u_1$};
\fill (u6) circle (1mm) node [above,] {$u_6$} ;
\fill (u5) circle (1mm) node [above ] {$u_5$};
\draw ellipse (3cm and 1.1cm) node (el) [above=12mm,] {$\bar{1}$};
\fill (u2) circle (1mm) node [left ] {$u_2$};
\draw (u2) ellipse (1.2cm and .7cm) node [above=7mm,] {$\bar{2}$};
\draw [thick] (u2) -- (u4) ;
\draw [very thick] (u2) -- (u1) ;
\end{tikzpicture}
\end{document}