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