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