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