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