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