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