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