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