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