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