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