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