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