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