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