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