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