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