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