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