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