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