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