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