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