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