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