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