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