This should combine a lot of answers.
# Convert dot to png via graphviz
dot -Tpng filename.dot -o filename.png
# Convert dot to svg via graphviz
dot -Tsvg filename.dot -o filename.svg
# Convert dot to eps via graphviz
dot -Tps filename.dot -o filename.eps
Keep in mind that on OSX (MAC), you need to install homebrew to install graphviz to be able to use the dot commands above.
brew install graphviz
It is also possible to install Graphviz (and use the commands above) through the package manager functionality of conda if you have Anaconda installed.
conda install python-graphviz