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