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