Hey Mike :0) I sometimes sweep it too, only when I'm doing one section only and repeating.. but when I do the whole thing on the 6 strings, I do it with alternate picking.
There ain't specific rules for this, cuz every body can do some variations to fit into a particular solo.
Anyway, I like to start this with an upstroke.
If you want to try sweeping with this "Shreddy Kruger" , here's how I like to do it, when I'm repeating one section only.
up-pull-down-down-up (return to begining with an upstroke , so that you sweep up)