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