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