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