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