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