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