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