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