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