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