PrintGraph takes a graph description and generates a 2D representation of it -- in Postscript, since
when I wrote PrintGraph back in 1995 that was by far the easiest way to get a quick and dirty graphical display
both printable and viewable onscreen (via ghostview, for instance). Still is, probably.
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Here is an example graph and its represenation (converted to GIF).
And here is PrintGraph's source and source to a random graph generator
that I used for testing. (.txt extension because FreeServers.com doesn't recognise .c.)