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