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