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