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