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)(11,15)(12,16)(13,14)(19,25)(24,31)(26,29)(30,32) involution — undirected(1,3)(2,5)(4,8)(6,7)(18,22)(19,26)(20,27)(23,28)(25,29)(30,32) involution — undirected(2,6)(5,7)(10,14)(15,16)(17,18,21,23)(19,24,25,31)(20,28,27,22)(26,30,29,32)(2,6)(5,7)(9,11,13,12)(10,15,14,16)(18,23)(22,28)(24,31)(30,32)(3,8)(5,7)(9,12,13,11)(10,16,14,15)(17,19,21,25)(18,24,23,31)(20,29,27,26)(22,30,28,32)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.