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