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