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