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