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