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