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