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