If you read through the page you linked, just above the Plotting in Pandas section is the following line:
If you want to make your plots look pretty like mine, steal the matplotlibrc file from Huy Nguyen.
In the post is a link to this gist, which contains the matplotlibrc
file. Make sure you read through the whole thing and customize it, as for example he has MacOSX
as his backend, which you may want to change.
To use the file, save it as ~/.matplotlib/matplotlibrc
and restart any running instances of IPython. Your plots should now look prettier :)