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