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