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