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