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