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