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)(18,23)(19,26)(20,22)(24,31)(27,32)(28,29)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,18,21,23)(19,27,28,24)(20,30,22,25)(26,31,29,32)(11,15)(13,16)(17,19,21,28)(18,24,23,27)(20,26,22,29)(25,31,30,32)(11,15)(13,16)(18,23)(19,28)(25,30)(26,29) involution — undirected(1,3,4,7)(2,6,5,8)(10,14)(13,16)(17,20,21,22)(18,25,23,30)(19,29,28,26)(24,32,27,31)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.