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