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