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