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