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