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