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