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