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