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