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