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