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