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