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