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