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