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