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