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