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