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