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