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