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