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