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