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