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