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