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