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