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