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