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