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