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