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