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