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