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