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