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