One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,12,14)(11,13,15,16)(17,18,23,26)(19,27,31,29)(20,22,25,21)(24,32,28,30)(2,5)(6,8)(11,15)(13,16)(17,18,21,25,23,26,22,20)(19,28,30,29,31,24,32,27)(9,11,12,15)(10,13,14,16)(17,19,23,31)(18,24,26,28)(20,29,25,27)(21,30,22,32)(1,3,4,7)(2,6,5,8)(17,20,21,18,23,25,22,26)(19,29,30,24,31,27,32,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.