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