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