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