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