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