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