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