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