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