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