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