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