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)(13,16)(14,15)(18,21)(19,23)(26,30)(28,32) involution — undirected(1,3,5,8)(2,6,7,4)(9,11,15,16)(10,13,14,12)(19,23)(22,24)(26,30)(27,31)(9,12,15,13)(10,16,14,11)(17,18)(19,22)(20,21)(23,24)(25,26)(27,28)(29,30)(31,32)(1,2)(3,6)(4,8)(5,7)(9,13,15,12)(10,16,14,11)(17,19,20,23)(18,22,21,24)(25,27)(26,28)(29,31)(30,32)(1,4,5,6)(2,3,7,8)(9,14,15,10)(11,13,16,12)(17,18)(19,22)(20,21)(23,24)(25,28)(26,27)(29,32)(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.