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