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)(19,26)(20,29)(21,27)(22,24)(23,31)(25,28)(30,32) involution — undirected(2,6)(7,8)(9,10,12,13)(11,14,15,16)(18,24)(19,20)(27,31)(28,30)(1,3,5,4)(2,7,6,8)(10,13)(11,15)(17,19)(18,25)(20,22)(21,28)(23,30)(24,32)(26,31)(27,29)(1,3,5,4)(2,7,6,8)(9,11)(10,14)(12,15)(13,16)(17,20,22,19)(18,26,24,29)(21,28,23,30)(25,27,32,31)(1,4,5,3)(2,8,6,7)(10,13)(11,15)(17,21,22,23)(18,27,24,31)(19,28,20,30)(25,29,32,26)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.