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