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