Scruffy requires dependencies which can be tricky to install.
Here's a way to install them easily.
# dependencies
brew install graphviz plotutils
brew install imagemagick --with-librsvg
# if you haven't `pip` yet
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
sudo python get-pip.py
# install `scuffy` and `image` (PIL replacement)
sudo pip install image scruffy
Tested on OSX 10.10.5