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