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