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