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