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