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