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