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