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