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