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)(11,15)(12,13)(14,16)(17,18)(19,26)(20,21)(22,23)(24,29)(25,30)(27,32)(28,31)(10,13)(14,15)(18,23)(20,30)(24,26)(27,31) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,10)(11,14)(12,13)(15,16) involution — undirected(3,7)(5,8)(9,11)(10,14)(12,16)(13,15)(17,19)(18,24)(20,31)(21,32)(22,29)(23,26)(25,28)(27,30) involution — undirected(1,3,4,7)(2,5,6,8)(17,20)(18,25)(19,27)(21,23)(22,30)(24,32)(26,28)(29,31)(1,2)(3,5)(4,6)(7,8)(17,21,22,25)(18,20,23,30)(19,28,29,32)(24,27,26,31)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.