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