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