One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,7)(9,10)(11,13)(12,14)(15,16)(21,29)(24,31)(26,32)(28,30) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,11,12,15)(10,13,14,16)(17,18)(19,20)(21,26)(22,27)(23,25)(24,30)(28,31)(29,32)(10,14)(13,16)(17,19,20,18,23,27,22,25)(21,26,28,24,29,32,30,31)(1,3,4,7)(2,6,5,8)(17,20,23,22)(18,19,25,27)(21,28,29,30)(24,26,31,32)(2,5)(6,8)(17,21,20,28,23,29,22,30)(18,24,27,32,25,31,19,26)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.