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