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