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