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