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