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