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