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