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