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