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