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