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)(25,26)(27,33)(28,39)(29,35)(30,40)(31,36)(32,37)(34,38)(1,2,4,5)(3,6,7,8)(10,16)(12,23)(17,19)(20,21)(25,27,32,30)(26,33,37,40)(28,31,38,35)(29,39,36,34)(1,2)(3,6)(4,5)(7,8)(9,11,15,13)(10,17,16,19)(12,20,23,21)(14,22,24,18)(25,28)(26,34)(27,31)(29,33)(30,35)(32,38)(36,40)(37,39)(1,2)(3,6)(4,5)(7,8)(9,12,15,23)(10,18,16,22)(11,21,13,20)(14,17,24,19)(25,29,32,36)(26,35,37,31)(27,34,30,39)(28,33,38,40)(1,3,4,7)(2,6,5,8)(9,13,15,11)(10,19,16,17)(12,20,23,21)(14,22,24,18)(25,30,32,27)(26,33,37,40)(28,35,38,31)(29,39,36,34)(9,14)(10,20)(11,22)(12,19)(13,18)(15,24)(16,21)(17,23)(25,31,32,35)(26,36,37,29)(27,38,30,28)(33,34,40,39)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.