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