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