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