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