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)(25,26,31,35)(27,36,40,32)(28,29,39,33)(30,34,37,38)(1,2,4,5)(3,6,7,8)(9,11,16,15)(10,17,14,20)(12,21,13,22)(18,23,19,24)(25,27)(26,32)(28,37)(29,34)(30,39)(31,40)(33,38)(35,36)(1,2)(3,6)(4,5)(7,8)(9,12,16,13)(10,18,14,19)(11,21,15,22)(17,23,20,24)(25,26,31,35)(27,32,40,36)(28,33,39,29)(30,34,37,38)(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)(26,33)(27,37)(29,35)(30,40)(31,39)(32,38)(34,36)(1,3,4,7)(2,6,5,8)(9,14,16,10)(11,17,15,20)(12,19,13,18)(21,23,22,24)(25,29,31,33)(26,28,35,39)(27,38,40,34)(30,36,37,32)(9,15,16,11)(10,17,14,20)(12,22,13,21)(18,23,19,24)(25,30,31,37)(26,34,35,38)(27,39,40,28)(29,36,33,32)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.