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