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