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