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