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