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