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