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