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