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