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