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