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