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