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