So if it was a direct contact print, what would affect your contrast and saturation are your printer lights -- if you overexposed the negative and then were able to print down, let's say in the high-30's / low-40's on average instead of the high 20's (normal), you'd get a print with more "snap". But you would have needed to start out with a denser negative in order to do that, otherwise just printing down would make the image darker than normal.
Like I said, some labs can push-process the print stock more to get a bit more contrast out of it.
That's about it in terms of improving the contrast and saturation of a normal Vision print.
I got a fairly contrasty print for "The Love Witch" recently mainly because I overexposed the stocks by one-stop and printed down.