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