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