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