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