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