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