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