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