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