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