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