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