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