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