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