Well, I just used SQLFairy using graphviz to create a PNG schema graph for a project that I am currently working on. I think that you might have some luck using that. My command-line looked like this: 
sqlt-graph -f MySQL -o blah.png -t png blah.sql

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In reply to Re: how to use Graphviz with sql by cyocum
in thread how to use Graphviz with sql by Anonymous Monk

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