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