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