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