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