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