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