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