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