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