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