Every draw style

There is no every draw available. One possible way is to style every path.

\documentclass{article}
\usepackage{tikz}
\begin{document}
    \begin{tikzpicture}[every path/.style={->,red,thick}]
    \draw(0,0)node[left]{$ A $}--(5,0)node[right]{$ B $};
    \end{tikzpicture}
\end{document}

An alternative solution is to globally set draw for every picture. In this way, color specification does not affect node!

\documentclass{article}
\usepackage{tikz}
\tikzset{every picture/.style={->,draw=red,thick}}
\begin{document}
    \begin{tikzpicture}
    \draw(0,0)node[left]{$ A $}--(5,0)node[right]{$ B $};
    \end{tikzpicture}
\end{document}

As other answers have said, you can set every path, but that changes the node styles. One way around this is to set every node just afterwards:

\documentclass{article}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[every path/.style={->,red,thick},
  every node/.style={draw,blue,thin}]
  \draw(0,0)--(5,0) node[rectangle] {XX} -- (5,-1);
\end{tikzpicture}

\end{document}