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