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