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