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