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