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