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