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