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