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