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