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