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