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