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