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