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