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