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