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