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