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