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