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