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