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