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