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)(11,14)(12,20)(13,15)(16,18)(17,21)(19,23)(22,24)(25,26,30,28)(27,31,35,33)(29,36,37,32)(34,39,40,38)(2,3)(6,7)(9,11,13,18)(10,14,15,16)(12,19,21,24)(17,22,20,23)(25,27,30,35)(26,31,28,33)(29,34,37,40)(32,38,36,39)(1,3,5,2)(4,7,8,6)(10,15)(11,18)(17,20)(19,24)(26,28)(31,33)(32,36)(38,39)(1,4)(2,6)(3,7)(5,8)(9,11)(10,16)(12,19)(13,18)(14,15)(17,23)(20,22)(21,24)(25,28,30,26)(27,33,35,31)(29,36,37,32)(34,39,40,38)(9,10)(11,16)(12,20)(13,15)(14,18)(17,21)(19,22)(23,24)(25,27)(26,31)(28,33)(29,34)(30,35)(32,38)(36,39)(37,40) involution — undirected(9,12,13,21)(10,17,15,20)(11,19,18,24)(14,22,16,23)(25,29,30,37)(26,32,28,36)(27,34,35,40)(31,38,33,39)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.