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