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