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