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