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