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