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