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