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