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