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