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)(19,27)(20,24)(21,25)(22,26)(23,31)(28,29)(30,32)(1,3,5,4)(2,6,7,8)(17,18)(19,28)(20,23)(21,25)(22,32)(24,31)(26,30)(27,29)(9,11,12,16)(10,13,14,15)(17,19)(18,23)(20,30)(21,31)(22,29)(24,26)(25,27)(28,32)(1,4,5,3)(2,6,7,8)(19,29)(20,31)(22,30)(23,24)(26,32)(27,28)(17,20,21,29)(18,24,25,28)(19,30,31,22)(23,26,27,32)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.