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