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