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