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