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