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