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