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