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