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