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