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