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