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