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