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