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