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