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