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