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