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