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