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