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