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