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