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