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