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