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