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