One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,16)(12,14)(13,15)(18,20)(19,23)(25,26,29,28)(27,30,31,32)(1,2,4,5)(3,7,8,6)(9,11,13,12)(10,14,15,16)(19,23)(22,24)(27,31)(30,32)(2,5)(6,7)(11,12)(14,16)(17,18,21,20)(19,22,23,24)(25,27,29,31)(26,30,28,32)(1,2)(3,6)(4,5)(7,8)(9,12,13,11)(10,14,15,16)(17,19)(18,22)(20,24)(21,23)(25,26,29,28)(27,30,31,32)(1,3,4,8)(2,6,5,7)(9,10)(11,16)(12,14)(13,15)(17,20,21,18)(19,24,23,22)(25,28,29,26)(27,32,31,30)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.