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