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