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