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