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