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