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