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