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