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