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