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