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