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