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