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