I needed a tool like this for my pfSense router, so I decided to go ahead and write my own. I loved getting these graphs from vnStat, and wanted it on my new router. Easy to share and nice to look at. Make sure you edit the config.php file to your liking.

Installing tools on pfSense

Install Status_Traffic_Totals package in package manager.
In the Traffic Totals panel, enable graphing.
Edit /usr/local/etc/pkg/repos/pfSense.conf and /usr/local/etc/pkg/repos/FreeBSD.conf to enable FreeBSD packages.
Install git pkg install git

It is important to note that you should return the repo configurtation to have FreeBSD as off before upgrades otherwise upgrades may fail.

Installation on pfSense

cd /usr/local/www
git clone https://github.com/GRMrGecko/vnStatGraphP.git