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