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