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