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