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