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