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)(12,13)(14,16)(17,18,21,19)(20,23,24,22)(26,29)(30,32)(2,6)(3,8)(9,11,13,16)(10,14,12,15)(18,19)(22,23)(27,31)(30,32)(2,6)(4,7)(10,12)(14,15)(17,19,21,18)(20,22,24,23)(25,26,28,29)(27,30,31,32)(1,3)(2,7)(4,6)(5,8)(9,11)(10,14)(12,15)(13,16)(25,27)(26,30)(28,31)(29,32) involution — undirected(1,4,5,7)(2,3,6,8)(9,12,13,10)(11,15,16,14)(17,20,21,24)(18,22,19,23)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.