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