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