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