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