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