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