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