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