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