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