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