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