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