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