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