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