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