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