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