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