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