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