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