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