32 is pretty cold... Most folks would say to serve around 45 degrees. If you're foaming like crazy at 32, you've got a few things to consider. What PSI are you serving at? How long are your lines? What's the ID?
I'd recommend getting longer lines, or smaller diameter lines. I use ~8-10ft of 3/16 ID hose and don't have a foaming problem. Also, if you're using a picnic faucet, make sure to open it all the way.