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