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