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