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