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