One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6,8,7)(10,16)(11,21)(12,14)(13,27)(17,32)(18,35)(19,20)(22,40)(23,28)(24,38)(25,39)(26,29)(30,33)(34,36)(1,3)(2,4)(5,7)(6,8)(9,10)(11,22)(12,19)(13,18)(14,16)(15,20)(17,23)(21,36)(24,34)(25,30)(26,37)(27,31)(28,40)(29,35)(32,39)(33,38) involution — undirected(2,6)(3,7)(5,8)(9,11)(10,17,20,34)(12,24)(13,28)(14,23)(15,25)(16,30,19,22)(18,36,35,32)(21,27)(26,39)(29,38)(31,33,37,40)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.