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