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