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