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