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