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