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