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