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