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