One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10)(11,14)(12,16)(13,15)(20,28)(22,31)(24,29)(26,30) involution — undirected(1,3,4,8)(2,5,6,7)(9,10,12,16)(11,15,13,14)(17,18,21,23)(19,25,27,32)(20,29,28,24)(22,30,31,26)(10,14)(11,13)(15,16)(17,19,21,27)(18,22,23,31)(20,30,28,26)(24,32,29,25)(2,6)(5,7)(9,11,12,13)(10,15,16,14)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.