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