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)(17,18,22,19,21,24,29,26)(20,23,28,25,27,30,32,31)(2,5)(3,7)(17,19,22,24,21,26,29,18)(20,25,28,30,27,31,32,23)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(17,20,21,27)(18,23,24,30)(19,25,26,31)(22,28,29,32)(2,5)(6,8)(18,24)(19,26)(20,27)(28,32) involution — undirected(9,11,12,15)(10,14,13,16)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.