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