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