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