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