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