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