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