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