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