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