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)(11,16)(12,15)(13,17)(14,18)(19,23)(20,22)(21,24)(1,2)(3,6)(4,7)(5,8)(9,11,14,12)(10,15,18,16)(13,19,21,20)(17,22,24,23)(26,31)(27,28)(29,37)(39,40)(9,10,14,18)(11,15,12,16)(13,17,21,24)(19,22,20,23)(25,26)(27,32)(28,33)(29,38)(30,31)(34,37)(35,40)(36,39)(1,3,5,4)(2,6,8,7)(9,10)(11,15)(12,16)(13,17)(14,18)(19,22)(20,23)(21,24)(25,27,30,28)(26,32,31,33)(29,35,37,36)(34,39,38,40)(1,3,5,4)(2,6,8,7)(9,12,14,11)(10,16,18,15)(13,20,21,19)(17,23,24,22)(25,28,30,27)(26,33,31,32)(29,36,37,35)(34,40,38,39)(1,4,5,3)(2,7,8,6)(9,13,14,21)(10,17,18,24)(11,19,12,20)(15,22,16,23)(25,29)(26,34)(27,35)(28,36)(30,37)(31,38)(32,39)(33,40)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.