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