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