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