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