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