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