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