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