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