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