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