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