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