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)(18,24)(22,23)(25,26)(27,34)(28,32)(29,38)(30,33)(31,37)(35,36)(39,40)(3,7)(5,8)(9,10)(11,15)(12,21)(13,17)(14,19)(16,20)(18,22)(23,24)(25,27,30,37)(26,31,33,34)(28,35,38,40)(29,36,32,39)(1,2)(3,5)(4,6)(7,8)(9,11)(10,14)(12,18)(13,19)(15,17)(16,22)(20,24)(21,23)(25,28,30,38)(26,32,33,29)(27,35,37,40)(31,39,34,36)(1,3,4,7)(2,5,6,8)(9,11)(10,15)(12,18)(13,19)(14,17)(16,23)(20,24)(21,22)(25,29)(26,28)(27,36)(30,32)(31,35)(33,38)(34,40)(37,39)(1,2)(3,5)(4,6)(7,8)(9,12)(10,16)(11,18)(13,20)(14,22)(15,23)(17,21)(19,24)(25,27)(26,31)(28,35)(29,36)(30,37)(32,39)(33,34)(38,40) involution — undirected(9,10)(11,14)(12,16)(13,17)(15,19)(18,22)(20,21)(23,24)(25,26)(27,31)(28,32)(29,38)(30,33)(34,37)(35,39)(36,40) 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.