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