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