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