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