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