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