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