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