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