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