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