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