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