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