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