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