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