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