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