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