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