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