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