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