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