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