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