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)(26,31)(27,36)(34,37)(35,40)(2,3)(6,7)(9,11,14,21)(10,15,18,19)(12,13,20,23)(16,17,22,24)(25,26,30,31)(27,32,36,33)(28,34,38,37)(29,35,39,40)(1,3,5,2)(4,7,8,6)(25,27)(26,32)(28,35)(29,37)(30,36)(31,33)(34,39)(38,40)(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)(26,33)(28,35)(29,34)(30,36)(31,32)(37,39)(38,40) involution — undirected(9,10)(11,15)(12,16)(13,17)(14,18)(19,21)(20,22)(23,24)(25,28,30,38)(26,34,31,37)(27,35,36,40)(29,32,39,33)(9,13)(10,17)(11,20)(12,21)(14,23)(15,22)(16,19)(18,24)(25,29)(26,35)(27,37)(28,32)(30,39)(31,40)(33,38)(34,36) 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.