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