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)(11,15,21,16)(12,17,23,13)(19,20,22,24)(25,26,31,35)(27,36,40,32)(28,29,39,33)(30,34,37,38)(3,7)(5,8)(9,11,14,21)(10,15,18,16)(12,22,23,19)(13,20,17,24)(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)(10,16)(12,19)(13,20)(14,21)(15,18)(17,24)(22,23)(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)(10,15)(12,19)(13,24)(14,21)(16,18)(17,20)(22,23)(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)(10,17)(11,19)(13,18)(14,23)(15,20)(16,24)(21,22)(25,29,31,33)(26,28,35,39)(27,38,40,34)(30,36,37,32)(9,13,14,17)(10,12,18,23)(11,20,21,24)(15,22,16,19)(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.