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