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