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