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