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