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