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