At this current time if you want xfce desktop you will need to download one of the following puppy versions.
- LighthousePUP: click here Lighthouse comes in both 32 and 64 bit versions. when you have the os setup you need to get the xfce addon.
- SalukiPUP: Saluki is not being maintained anymore but you can download it click here
- CarolinaPUP: click here this is a fork of Saluki which is being developed and is currently being maintained.