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