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