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