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