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