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