I've downloaded stable Graphviz for Windows, but I have no idea which of the zillion .exe files is supposed to be the right one, or how to see the graph at all.
For the Windows Graphviz package the tool you want is gvedit.exe (dot.exe if you're doing it on the command line but gvedit.exe is a convenient GUI tool). Run it and open the file.
Alternatively, for an online solution, check out https://www.google.com/search?q=online+graphviz+renderer though. There's a whole bunch of web-based renderers and you can just paste the contents of the files and get images back.
