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