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