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