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