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