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