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