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