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