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