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