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