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