Snow could be a problem going over the passes from Vegas. You'll need to check the weather and possibly the California Dept of Trans (DOT) to see if the passes are open. Once you cross the Sierra Nevada range you shouldn't have any problems with snow. Unfortunately there aren't many routes from Vegas to SF if snow closes the passes (once closed they are closed for the season).
The most scenic route, if the passes are open, is to take the 160 out of Vegas. Then take hwy 372/178 to Shoshone. Follow the 178 through Death Valley until it connects with the 190 west. Follow the 190 until it meets the 136 (to Lone Pine). Then take the 395 north until you reach the 120 that will take you up a very big climb into Yosemite. Follow the 120 all the way to Manteca. There are then a couple of ways for you to get to the SF bay area. If snow has closed the passes (very possible) you either take the 395 upto Carson City, Nevada or take hwy 95 out of Vegas north to Fallon, Nevada. You can then take hwy 50 to Carson and Lake Tahoe.
It is very possible you'll run into some snow at the higher elevations. If you get to Vegas at the beginning of November you may just beat the snow. Also be prepared for rain on the coast route. This is the beginning of the rainy season.
Hope this helps. Good Luck.