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