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