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