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