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