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