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