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