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