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