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