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