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