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