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