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