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