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