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