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