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