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