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