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