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