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