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)(19,24)(20,30)(21,28)(22,27)(23,25)(26,31)(29,32) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,18,22,27)(19,21,29,31)(20,25,23,30)(24,26,32,28)(2,6)(7,8)(10,14)(11,16)(17,19,20,26,22,29,23,28)(18,24,30,31,27,32,25,21)(1,3,5,4)(2,7,6,8)(10,14)(13,15)(17,20,22,23)(18,25,27,30)(19,28,29,26)(21,24,31,32)(1,4,5,3)(2,8,6,7)(17,21,23,32,22,31,20,24)(18,26,25,19,27,28,30,29)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.