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