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