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