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