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