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