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