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