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