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