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