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