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