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