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