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