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