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