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