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)(27,37)(28,31)(29,38)(30,34)(32,36)(33,40)(35,39) involution — undirected(1,2)(3,6)(4,7)(5,8)(9,10,14,15)(11,16,18,13)(12,17,22,24)(19,21,20,23)(25,27)(26,33)(28,38)(29,34)(30,35)(31,39)(32,40)(36,37)(1,3)(2,5)(4,8)(6,7)(25,28,32,30)(26,34,36,31)(27,38,40,35)(29,37,39,33)(1,2)(3,5)(4,7)(6,8)(9,11)(10,16)(12,20)(13,15)(14,18)(17,23)(19,22)(21,24)(25,29,32,39)(26,35,36,38)(27,34,40,31)(28,33,30,37)(1,3)(2,6)(4,8)(5,7)(9,12,14,22)(10,17,15,24)(11,19,18,20)(13,23,16,21)(25,30,32,28)(26,34,36,31)(27,38,40,35)(29,33,39,37)(1,2)(3,5)(4,7)(6,8)(9,13,14,16)(10,11,15,18)(12,21,22,23)(17,20,24,19)(25,31,32,34)(26,30,36,28)(27,39,40,29)(33,35,37,38)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.