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