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