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)(11,16)(12,14)(13,15)(17,18,23,22)(19,24,29,32)(20,25,21,26)(27,30,28,31)(1,3)(2,5)(4,8)(6,7)(17,19,23,29)(18,24,22,32)(20,30,21,31)(25,28,26,27)(9,11,13,12)(10,14,15,16)(17,20,22,26,23,21,18,25)(19,27,24,30,29,28,32,31)(2,6)(5,7)(20,21)(25,26)(27,28)(30,31) involution — undirected(3,8)(5,7)(9,12,13,11)(10,14,15,16)(17,21,22,25,23,20,18,26)(19,28,24,31,29,27,32,30)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.