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