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