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