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