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