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