Does any of the stuff at <URL:http://www.graphviz.org/doc/FAQ.html#Q22> help for that? It would require coordinates, but you can get those by running dot on your graph on a system that you believe produces the desired layout.
The `pos` attribute seems like it will work. I will experiment with it to see...
Also, I experimented with using <boost/graph/dimacs.hpp> and <boost/graph/read_dimacs.hpp> instead of `parse_noigen.hpp`, but I think that the "NOIGEN format" is a modification of the DIMACS format. As explained on http://www.avglab.com/andrew/CATS/maxflow_formats.htm , DIMACS uses "n" lines, whereas NOIGEN does not. This is why the BGL DIMACS parsing utilities kept throwing exceptions.
How are the source and target of the flow specified in NOIGEN? I.e., what is the equivalent to a DIMACS "n" line?
The NOIGEN format specifies a min-cut problem, which does not use source and target vertices in the definition of the problem. So, there is no equivalent to the DIMACS "n" line.