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