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)(11,15)(12,14)(13,16)(17,18,20,23)(19,25,27,22)(21,30,29,24)(26,31,28,32)(2,5)(6,7)(9,11)(10,13)(12,16)(14,15)(17,19,20,27)(18,22,23,25)(21,26,29,28)(24,31,30,32)(9,10)(11,15,16,13)(12,14)(19,26,27,28)(22,31,25,32)(1,3,4,8)(2,6,5,7)(10,14)(13,15)(18,23)(22,25)(24,30)(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.