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