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