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