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