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