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