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