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