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