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