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