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