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