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