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