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