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