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